Module 4.2

Question 1

What is the general formula of alcohols

Answer 1

CnH2n+1 OH

Question 2

What is a primary alcohol

Answer 2

When the OH Group is attached to a carbon with 1 alkyl chain

Question 4

What is a secondary alcohol

Answer 4

When the OH Group is attached to a carbon with 2 alkyl chains

Question 5

What is a tertiary alcohol

Answer 5

When the OH Group is attached to a carbon with 3 alkyl chain

Question 6

How does alcohol boiling / melting point change with chain length

Answer 6

As chain length increases, boiling / melting point increases.

This is because surface contact increases so the london forces are stronger

Question 7

Why is the boiling point of alcohols higher than alkenes

Answer 7

As hydrogen bonds form between the OH groups between the molecules

Question 8

What is the solubility of alcohols

Answer 8

Water molecules and the OH groups of alcohol are polar.
Because of this, methanol, ethanol and propanol are soluble in water

As the alkyl chain increases the solubility of the alcohol decreases. (As the alkyl chain cant form hydrogen bonds)